Open Systems Adapter-Express 114 · The OSA-Express features support Virtual IP Address (VIPA) in the TCP/IP environment. VIPA frees TCP/IP hosts from dependence on a particular network attachment. VIPA provides for multiple IP addresses to be defined to a TCP/IP stack, allowing fault-tolerant, redundant, backup paths to be established. Applications become insensitive to the condition of the network since the VIPA will always be active, enabling users to route around intermediate points of failure in the network. VIPA Takeover and Takeback allow for fast connection recovery in the event of a TCP/IP stack services or application failure. Should a stack or configured application fail, the IP addresses are transferred to backup copies and the OSA-Express features using QDIO are updated dy- namically. Network access services can continue uninterrupted. This VIPA support also facilitates movement of applications and workload within the sysplex in a manner transparent to end-user connection requests. · OSA-Express allows network traffic from multiple LPARs to travel through the same port. TCP/ IP and SNA/APPN/HPR traffic can be mixed on the same port simultaneously. References For further information on the OSA-Express features and configuration, see: · Open Systems Adapter-Express Customer's Guide and Reference for z990 , SA22-7935 · · · · Open Systems Adapter-Express Customer's Guide and Reference for zSeries, SA22-7476 Open Systems Adapter-Express Customer's Guide and Reference for S/390, SA22-7403 Open Systems Adapter-Express Implementation Guide, SG24-5948 z/OS Open Systems Adapter Support Facility User's Guide, SC28-1855